Abstract
<p>The aimed of this study was to determine the plankton communities and its relationship with the chemical and physical condition in seagrass ecosystem at Pegametan Bay. The composition and abundance of plankton were observed in the sea water underneath the surface and were identified based on the guideline of Illustration of the Marine Plankton of Japan. The water quality was measured in situ using <em>WQC </em>HI 9829. The water sample was measured using closed reflux spectrometry for COD, TOC analyzer for DOC and APHA 2102 (4500) method for Nt and Pt. There are 27 species of plankton identified, which can be classified into three groups. Diatom group consists of 18 species with a 74.56% abundance. The non-litoral group consists of 6 species with a 23.35% abundance. Moreover, dinoflagellate group consist of 3 species with a 2.09% abundance. An abundance of plankton greater than 10<sup>4 </sup>cell.L<sup>-1</sup> was found in diatome group (<em>Nitzschia </em>sp.<em>, Thalassiosira</em> sp.,<em> Chaetoceros</em> sp., <em>Flagillaria</em> sp., <em>Thalassiothrix</em> sp., and <em>Melosira</em> sp.) and non-litoral group (<em>Oscillatoria</em> sp. and <em>Spirogyra</em> sp.). The abundance of those species indicated the algae bloom phenomenon. <em>Dinophysis</em> sp. was also identified, which was harmful algal blooms.</p><p><strong>How to Cite</strong></p><p>Setiabudi, G. I., Bengen, D. G., Effendi, H., &amp; Radjasa, O. K. (2016). The Community Structure of Phytoplankton in Seagrass Ecosystem and its Relationship with Environmental Characterstics. <em>Biosaintifika: Journal of Biology &amp; Biology Education</em>, 8(3), 257-269.</p>
Highlights
Seagrass is one of the important ecosystems at the tropical coastal region
At the time of research investigation, there were three seagrass species identified at Pegametan Bay, namely, Enhalus acoroides, Thalassia hemprichii and Halophila ovalis (Figure 1, 2 and 3)
The phytoplankton community structure, in this case, the composition and abundance at Pegametan Bay were influenced by the environmental characteristic, that was enclosed, and the mariculture activities
Summary
Seagrass is one of the important ecosystems at the tropical coastal region. The degradation of the seagrass ecosystem has always been followed by algae blooms (Kennish, 2010). High mariculture activities and large quantities of floating fish cages affected the condition of the waters of Pegametan Bay. High loading of feed loss, metabolism waste, mariculture process (such as fresh water for disinfection and the rubbish left by the workers), the condition of the bay that is closed resulted in high pollution (Price et al, 2015). High loading of feed loss, metabolism waste, mariculture process (such as fresh water for disinfection and the rubbish left by the workers), the condition of the bay that is closed resulted in high pollution (Price et al, 2015) Those are observed from the condition of the waters around the floating fish cages, which was consistently dark green. Such watercolor shows high turbidity as a result of a high plankton abundance. The scope of this study covered three sections, namely, the characteristics of the environment, the variability of the plankton community in the water column and the influence of the environment on the variability of the plankton community at Pegametan Bay
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